Testing, using a Google Chrome browser on Windows 10 desktop, can bookmark a HTML5 export of this eBook on an HTTPS server, then shut off the internet (Airplane mode), and still be able to view the eBook which I suspect has been cached in the Google Chrome browser cache. The eBook project is large, with 282 pages, plus numerous graphics (mostly PNG's) illustrating the eBook's text. I have been testing the PWA feature for HTML5 export in QXP 2018.
